Diagonally reinforced concrete coupling beams (DRCBs) have been widely adopted in reinforced concrete (RC) bearing wall systems. DRCBs are known to act as a fuse element dissipating most of seismic energies imparted to the bearing wall systems during earthquakes. Despite such importance of DRCBs, the damage estimation of such components and the corresponding consequences within the knowledge of performance based seismic design framework is not well understood. In this paper, drift-based fragility functions are developed for in-plane loaded DRCBs. Fragility functions are developed to predict the damage and to decide the repair method required for DRCBs subjected to earthquake loading. Thirty-seven experimental results are collected from seventeen published literatures for this effort. Drift-based fragility functions are developed for four damage states of DRCBs subjected to cyclic and monotonic loading associated with minor cracking, severe cracking, onset of strength loss, and significant strength loss. Damage states are defined in a consistent manner. Cumulative distribution functions are fit to the empirical data and evaluated using standard statistical methods.

A B S T R A C T
 1. 서 론
 2. 현행 구조기준상의 대각보강된 연결보 배근 상세요약
 3. 대각보강된 연결보 실험체 데이터베이스 (Database)
 4. 손상수준 (Damage state)의 정의
 5. 변위비 기반 취약도 함수 개발
 6. 요약 및 결론
 REFERENCES

• 이창석(한양대학교 건축공학과 박사후 연구원) | Lee Chang Seok (Department of Architectural Engineering, Hanyang University)
• 한상환(한양대학교 건축공학과) | Han Sang Whan (Department of Architectural Engineering, Hanyang University) Corresponding author
• 고혜영(미국 위스콘신 주립대 (매디슨) 토목공학과) | Koh Hyeyoung (Department of Civil Engineering, University of Wisconsin-Madison)